Mechanical pencil



May 10,- 1927.

1,627,602 8. B. GOLDSMITH. IBCHANICAL PENCIL Filed April 7-29 1921 -16 2 p 1 I 17 J ATTORNEY Patented May 10, 1927.

UNITED STATES- BYRON B. GOLDSMITH, OF NEW YORK, N. Y.

MECHANICAL PENCIL.

Application filed April 29, 1921. Serial No. 465,359.

The present invention relates to that class of pencils in which a holder is provided for receiving and properly supporting a pencil lead; so constructed that the lead, when inserted into the end of the holder, may be gradually fed forward at will by turning the exterior casing with relationto the lead tube or holder.

The principal object of the invention is to provide an article of this character which shall be as simple and cheap as possible. comprising very few parts, easily assembled and reliable in operation.

The invention is illustrated in a preferred form in the accompanying drawings, where in Figure 1 is a side elevation of the complete pencil, Figure 2 is a longitudinal scctional view of the same on a larger scale, Figure 3 is a similar view of the outer casing viewed from the right in Figure 2, and Figure 4 is a transverse sectional view on the plane 4-4 in Figure 2.

The hollow cylindrical casing 10 forms the handle or body of the pencil, and is provided with a tip 11 which receives the lead 12.

The lead tube proper is formed by coiling a wire 13 into helical form, as shown, the helix having an internal diameter such as to afford aproper working and supporting fit for the lead 12. One end of the helix enters the tip 11, to which it is fixed by soldering or otherwise, while the other end occupies an axial position within the cylindrical casing or holder 10. The tip is preferably provided with a shoulder 14, which rests rotata-bly against the end of the body or casing 10. Any appropriate shield, such the conical shell 15, serves to cover the junction ofthe tip and casing, and to hold the tip in a fixed posit-ion against longitudinal movement. If I the tip 11 is perfectly cylindrical the helix can extend clear through to the front. If however, the tip 11 has a tapered point it is best to insert a cylindrical shell 110 which fits the lead and forms a continuation of the helix.

For the purpose of pushing forward the lead, as well as to support its rear end when in use, a pusher rod 16 is provided, which is placed axially within the helix 13 as shown. Its rear end is bent outward, as at 17, to

project between two turns of the wire. Means are provided whereby rotary movement of the casing or body 10 may be transmitted to the tip 17; and in the form shown this is a simple straigl'lt interior groove 18 formed in the casing 10, into which the tip 17 projects.

From the above description it will be clear that, in order to cause outward movement of the lead, it is only necessary to grasp the tip 11 with one hand to turn the casing 10 with the other. This will revolve the tip 17, causing it to travel along the spiral coil 13, thus moving the pusher rod forward, and with it the lead 12. Opposite rotation will draw back the pusher, leaving the lead free to be pushed inward by pressure on its tip.

The structure herein described may be modified in various ways without departing from the scope of my invention, and I do not limit myself to the details herein shown and described.

lVhat I claim is 1. A mechanical pencil comprising a 1101 low cylindrical casing, a revolubly mounted lead-holding tip extending partly within and partly without said casing, and having a shoulder abutting against the forward end of said casing and a shell having a cylindrical portion fitting over the end of the casing and a conical portion enclosing said shoulder and fitting, at its narrow end, the lead holding tip.

2. Apparatus as inclaim 1 wherein the tip is made tapering and wherein an internal shell 110 is fitted within the tapering end, said shell being adapted to fit the lead.

3. In a mechanical pencil, a body portion having a cylindrical bore open at the front end, a tubular steadying tip fitting revolubly into said bore and projecting outside thereof, a shoulder on said tip resting against the end of the pencil body, an external shell fitting the end of the body and having a conical portion adapted to confine said shoulder to hold the tip in place, a wire helix fixed within said tip, a pusher within said helix having a portion projecting through the helix and means fixed to the pencil body for engaging said projecting portion of the pusher.

4:. A mechanical pencil comprising a hollow body, a tapering steadying tip projecting partly into and partly out of the same, a lead tube formed of a. wire coiled helically to fit the lead and fixed to said tip, a pusher rod Within said helix and having a portion in engagement with the coils thereof, means for rotating said pusher rod to cause it to travel along said helix and an internal shell 110 fitted within the tapering tip, said shell being adapted to fit the lead.

In testimony whereof I have hereto set my hand on this 27th day of April, 1921.

BYRON 'B. GOLDSMITH. 

